/*
 * syscalls.c
 *
 *  Created on: 03.12.2009
 *      Author: Martin Thomas, 3BSD license
 */

// #define SBRK_VERBOSE 1

#include <reent.h>
#include <errno.h>
#include <stdlib.h> /* abort */
#include <sys/types.h>
#include <sys/stat.h>

//#include "term_io.h"
#include "stm32f10x.h" /* for _get_PSP() from core_cm3.h*/

#undef errno
extern int errno;

extern void DBGU_PutChar(unsigned char c);

int _kill(int pid, int sig)
{
	pid = pid; sig = sig; /* avoid warnings */
	errno = EINVAL;
	return -1;
}

void _exit(int status)
{
	//xprintf("_exit called with parameter %d\n", status);
	while(1) {;}
}

int _getpid(void)
{
	return 1;
}


extern char _end; /* Defined by the linker */
static char *heap_end;

char* get_heap_end(void)
{
	return (char*) heap_end;
}

char* get_stack_top(void)
{
  return (char*) __get_MSP();
	//return (char*) __get_PSP();
}

caddr_t _sbrk(int incr)
{
	char *prev_heap_end;
#if SBRK_VERBOSE
	xprintf("_sbrk called with incr %d\n", incr);
#endif
	if (heap_end == 0) {
		heap_end = &_end;
	}
	prev_heap_end = heap_end;
#if 1           
	if (heap_end + incr > get_stack_top()) {
#if SBRK_VERBOSE
		xprintf("Heap and stack collision\n");
#endif    
		abort();
	}
#endif
	heap_end += incr;
	return (caddr_t) prev_heap_end;
}
  
int _close(int file)
{
	file = file; /* avoid warning */
	return -1;
}

int _fstat(int file, struct stat *st)
{
	file = file; /* avoid warning */
	st->st_mode = S_IFCHR;
	return 0;
}

int _isatty(int file)
{
	file = file; /* avoid warning */
	return 1;
}

int _lseek(int file, int ptr, int dir) {
	file = file; /* avoid warning */
	ptr = ptr; /* avoid warning */
	dir = dir; /* avoid warning */
	return 0;
}

int _read(int file, char *ptr, int len)
{
	file = file; /* avoid warning */
	ptr = ptr; /* avoid warning */
	len = len; /* avoid warning */
	return 0;
}


int _write(int file, char *ptr, int len)
{
	int todo;
	file = file; /* avoid warning */
	for (todo = 0; todo < len; todo++) {
		DBGU_PutChar(*ptr++);
	}
	return len;
}
